Panasonic LP-310 Operation Manual page 68

b. Input the expiry date function character.
Refer to "3-4-2 Setting of Expiry Date Function" (P.105) for detail setting.
Press
1
Adjust the cursor to the first line "01" on the
2
screen, and press
* Re-adjusting the cursor to the first line (01) and then
pressing (double-clicking) the same cursor performs
the same operation.
Press [EXPIRY].
3
Set "1" to [Expiry No.].
4
Set the expiry No. using
Set "2" to [Figure].
5
Set the display digit using
68
.
.
EDIT
button.
button.